User Guide - Honeywell
Contents
1. PLEASE RESPECT YOUR ENVIRONMENT Take care to dispose of this product and any packaging or literature in an appropriate way WHAT IS A PROGRAMMER an Explanation for Householders as recommended by the Energy Savings Trust Programmers allow you to set On and Off time periods Some models switch the central heating and domestic hot water on and off at the same time while others allow the domestic hot water and heating to come on and go off at different times Set the On and Off time periods to suit your own lifestyle On some programmers you must also set whether you want the heating and hot water to run continuously run under the chosen On and Off heating periods or be permanently off The time on the programmer must be correct Some types have to be adjusted in spring and autumn at the changes between Greenwich Mean Time and British Summer Time You may be able to temporarily adjust the heating programme for example Override Advance or Boost These are explained in the manufacturer s instructions The heating will not work if the room thermostat has switched the heating off And if you have a hot water cylinder the water heating will not work if the cylinder thermostat detects that the hot water has reached the correct temperature Clarity approved by Plain English Campaign WHAT IS A ROOM THERMOSTAT an explanation for Householders as recommended by the E2. The hot water MODE button operates in the same way as described above for the heating MODE button Overriding the Operation Without Changing the Programmes In AUTO and ONCE operating modes the OVERRIDE buttons switch the heating or hot water ON or OFF without altering the programme When the MII or f symbol is displayed pressing the OVERRIDE button switches the heating or hot water OFF until the next programmed ON time If the MT or F symbol is not displayed pressing the OVERRIDE button switches the heating or hot water ON until the next programmed OFF time The LoT Display will provide you with information about the override 12 The Extra Hour Function for Heating and or Hot Water The EXTRA HOUR buttons allow you to switch the heating or hot water ON for up to 3 extra hours without altering the programme Pressing either button once will give one extra hour The LoT Display will display the message 1HR to confirm the button has been pressed When the heating or hot water are OFF the TI or as symbols are not displayed pressing an EXTRA HOUR button switches the heating or hot water ON for just one hour When the heating or hot water are ON the III or F symbols are displayed pressing an EXTRA HOUR button extends the programmed ON period by one hour Further presses of the EXTRA HOUR buttons will increase the extra hour period by one hour for each button press up to a maximum of 3 hours The Lo
3. If these latter overrides are required it is first necessary to change the ST9420C mode setting to AUTO or ONCE Troubleshooting Guide This is a quick guide to help you diagnose and cope with possible problems with your wireless control system For further assistance please contact your Installer ST9420C has a blank LCD display ST9420C indicates that Heating and or Hot Water are ON but radiators are cold and or taps are running with cold water ST9420C shows the message INTERNAL FAULT Every few seconds the ST9420C screen shows the message SERVICE DUE pam m a Although the heating is still operating the ST9420C screen keeps flashing the message Z N S Ca Zevce oug C No power to the heating system Check that there is power to the heating system Fault in ST9420C Temperature controls are switched off or set too low Call Installer Check that the temperature controls in the system are set to appropriate levels Boiler or other system controls have malfunctioned Fault in ST9420C ST9420C is counting down the number of days until your next boiler service is due Your boiler service is overdue Call Installer Call Installer Arrange a boiler service before the counter reaches zero After servicing your boiler the Service Engineer Installer will reset the ST9420C to remind you when the next boiler service is due Each service is normally a maximum of
4. ey on offs per day efault time programme standard at home econom Dae aoa eo Optimum start no optimum start delayed start optimum start on Optimum start limit 1 hour 2 hours 3 hours moe e e aaa oa enabled Frost protection temperature From 5 to 16 C sc oOo Minimum ON OFF time 1 2 3 4 5 minutes 1 minute o oO oO o as ie eee per hour Proportional band width Froom1 5to3 0 C 15 C Failsafe mode loss of AF of yo SSS S communications fon20 TT 34 50047645 008 A
5. 1 year apart Arrange an immediate boiler service After servicing your boiler the Service Engineer Installer will reset the ST9420C to remind you when the next boiler service is due Each service is normally a maximum of 1 year apart 29 FAQ AND TROUBLESHOOTING Symptom Possible Cause The ST9420C screen shows Your boiler service the message is overdue and the boiler has been automatically gt SERVICE DUE switched off to S r pr ensure your safety Lf ST9420C shows the Your DT92E message SENSOR LOW batteries are BATT and a flashing radiator running low on symbol 11 power DT92E shows a flashing battery symbol DT92E display is blank ST9420C shows the Your CS92A message SENSOR LOW batteries are BATT and a flashing tap running low on symbol a power CS92A battery low indication press CS92A button and red light gives a short flash every second 0 1s on 0 9s off Note light will switch off after approx 1 minute to save battery power 30 Arrange an immediate boiler service If set to do so it may be possible to obtain limited use of the boiler by pressing any EXTRA HOUR buiton Each button press will allow operation of the boiler for 1 hour at a time and the screen will display the message On 1h After servicing your boiler the Service Engineer Installer will reset the ST9420C to remind you when the next boiler service is due Each service
6. a flashing path between products and re position any flame symbol a ST9420C and objects that may be blocking Red light on BDR9IT if BDR91T is blocked the signal installed is lit continuously Boag Py a metal ST9420C shows the Fault with DT92E Call Installer message SENSOR FAULT and a flashing radiator symbol DT92E display shows and a flashing spanner symbol 31 FAQ AND TROUBLESHOOTING Symptom Possible Cause ST9420C shows the CS92A sensor message SENSOR FAULT cable may be and a flashing tap symbol disconnected from the wiring terminals CS92A sensor error Fault with CS92A indication Press CS92A button and red light blinks 0 5s on 0 5s off Note light will switch off after approx 1 minute to save battery power 32 Remedy Re connect the sensor wired to the CS92A terminals Call Installer 33 Insert application number as per Installation wiring diagrams Configuration Data to be completed by Installer The tables below are for the Installer to complete to indicate how your ST9420C and DT92E have been configured ST9420C Configuration standard 24hr or am pm clock am pm display VY display 24hr display Display backlight operation Off on if button pressed on continuously Automatic time change disabled enabled 1 day or 5 2 day or 7 day 1 day operation operation 5 2 day operation 7 day operation Number of ON OFFs per 2 on offs per day
7. features to suit your requirements You can set Optimum Start Delayed Start or Optimum Stop and you can also set a limit to the Optimum Start time of 1 2 or 3 hours Note the radiator symbol IM will flash to indicate Optimisation is taking place The diagrams below illustrate how Optimisation works Optimum Start Optimum Stop Optimum Start Programmed Time Optimum Stop Programmed Time O q 2 i i i z saadi Comfort 1 i f temperature t Temperature fi T L 1 1 fi 0500 0600 0700 Time 2100 2200 2300 Time Delayed Start Programmed Time 7 p Delayed Start ONE weet ono A i a Comfort temperature Temperature 0500 0600 0700 Time 17 FINE TUNING YOUR ST9420C How to set your Hot Water Set Temperature If your system includes a CS92A hot water sensor on your hot water storage tank you will be able to set the hot water temperature you require at the ST9420C programmer The temperature is set to 60 C at the factory but can be set anywhere between 40 C and 85 C depending on the application The setting is changed by entering Installer Mode and modifying parameter number 8 to give the required set temperature BOILER SERVICE REMINDER If your house is rented by Law your gas boiler should be inspected once a year to ensure it is operating safely Your ST9420C Programmer has a range of features designed to help make sure this service is carried out at the correct time These fe
8. is normally a maximum of 1 year apart Change the DT92E batteries see page 21 for how to do this Change the CS92A batteries This is located next to your hot water storage tank see page 25 for a description of how to change the batteries FAQ AND TROUBLESHOOTING Symptom Possible Cause Remedy ST9420C shows the Your DT92E Change the DT92E batteries message NO SIGNAL and batteries are see page 21 for how to do this a flashing radiator symbol running low on power DT92E shows a flashing RF RF communication Check direct path between both symbol path between products and re position any ST9420C and objects that may be blocking DT92E is blocked the signal AN by a metal Relocate the DT92E if possible ST9420C shows the Your CS92A Change the CS92A batteries message NO SIGNAL and batteries are This is located next to your hot a flashing tap symbol E running low on water storage tank see page power 25 for description of how to CS92A communications change the batteries failure indication Press CS92A button and red light RF communication Check direct path between both comes on Note light path between products and re position any will switch off after approx ST9420C and objects that may be blocking 1 minute to save battery CS92A is blocked the signal power possibly by a metal object ST9420C shows the message RF communication Check direct path between both NO SIGNAL and
9. left in HOT WATER Programming mode for more than 10 minutes without the slider being moved or any buttons pressed the message MOVE SLIDER will be displayed Press a button to continue programming or move the slider to the RUN position Modifying the Heating Programme The heating programme has three pairs of ON OFF switching times per day Each time can be set between 3 00 am and 2 50 am on the next day to allow you to programme the heating to stay on past midnight if required a Move the slide switch to the HEATING position SET HEATING will show briefly to verify this action HOT WATER HEATING DAY TIME SET HEATING HOT WATER HEATING RUN Honeywell NODE b Now follow the same procedure to set the times as described in Modifying the Hot Water Programme page 9 steps b to i Exiting HEATING Programming Mode To exit HEATING programming mode move the slider to the RUN position This can be done at any time during the programming process and any changes made and confirmed with the K button will have been saved Note If the unit is left in HEATING Programming mode for more than 10 minutes without the slider being moved or any buttons pressed the message MOVE SLIDER will be displayed Press a button to finish programming or move the slider to the RUN position Disabling or Enabling Time Periods for Heating and or Hot Water To disable any of the time periods ON
10. necessary to interact with the BDR91T However it is possible to press the button and temporarily override the current relay position This will be cancelled as soon as the Relay Box receives another signal from the ST9420C because automatic operation has a higher priority than manual operation g Push button Loss of Wireless Communications If the RF communication is lost for a period of 1 hour the red light will illuminate The Relay Box will then enter the failsafe mode as selected by your Installer see page 34 When RF communication is restored the Relay Box will automatically return to normal operation 26 How do set the time only if the ST9420C clock is not correct Your ST9420C contains an accurate digital clock that is factory set Should you ever need to change the time just follow this procedure a Move the slider to the DAY TIME position b Keep pressing the green Ok button until the message SET THE TIME is displayed To change the time press the or buttons until the correct time is shown The message IS TIME OK will be displayed Press the green button to confirm the time is correct If you have made a change the message TIME SAVED will show followed quickly by DATE TIME COMPLETE c Move the slider to the RUN position to complete changing the time What do do when the clocks go back in October and forward in March Your ST9420C is factory set to ch
11. of the OVERRIDE feature is when you return home unexpectedly for the rest of the day and the heating is off Just press the heating OVERRIDE button and the heating will come on until the next programme time at which point it will follow the normal programme The advantage here is that you do not have to remember to switch off because the normal time programme does this for you A typical use of the EXTRA HOUR button would be if you returned to the house for a short period when the heating and hot water were off Pressing the appropriate EXTRA HOUR button gives you 1 2 or 3 hours of heating exactly when you need it Another typical use is when the heating is already on and you want it to stay ona little longer just press EXTRA HOUR and for that day only an hour will be added to the end of the time at which heating normally goes off The MODE buttons allow you to select how you want to operate heating and hot water independently The most obvious use is to switch heating OFF during the summer months but you may also use this feature if you take a mid week day off work you can then set the MODE to ONCE to keep the system ON during the day from the first programmed ON time till the last programmed OFF time The way to use a Room Thermostat The way to set and use your room thermostat is to find the lowest temperature setting hat you are comfortable with and then leave it alone to do its job The best way to do this is to set the room therm
12. one of the next programme times already in the memory Similarly when pressing the button the previous ON or OFF marker may start to flash This indicates you have tried to set a time equal to one of the previous programme times If this happens the ST9420C simply moves both times together as long as you continue to press the or buttons Follow the procedure in Reviewing the Programme Times page 9 to check and adjust these times as necessary c SET OFF TIME 1 will be displayed and the first OFF 1 time will now be flashing If you do not wish to change the time press the green button and move to the next step Otherwise use the or buttons to change the time Press the green button to confirm the time is correct and move to the next step SAVED will be displayed for a moment to confirm that any change has been saved to memory d The remaining ON and OFF times ON 2 OFF 2 ON 3 OFF 3 can be set by using the or buttons to change the time then the green button to confirm the time is correct and move to the next step If you do not wish to change the time just press the green Ok button to move directly to the next ON OFF time without making any changes e After setting or reviewing the last off time OFF 3 the message COMPLETE will be displayed to indicate the times for Monday have been set You now have a choice of how to set the programme for the next day Copying One Day s
13. 00pm 1 00pm 4 30pm_ 11 00pm Built in Programme Profile C ON 1 OFF 1 ON 2 OFF 2 ON3 OFF 3 Monday to Heating 6 30am _ 7 30am 2 00pm 12 00pm 5 00pm 10 00pm Friday Hot Water 6 30am 7 30am 12 00pm 12 00pm 5 00pm 10 00pm Saturday amp Heating 8 30am _ 9 30am 2 00pm 1 00pm 5 30pm _ 10 30pm Sunday Hot Water 8 30am 9 30am 12 00pm 1 00pm 5 30pm _ 10 30pm Your Personal Programme The table below has been left blank for you to record your own personal programme OoN 1 OFF 1 ON 2 OFF 2 ON 3 OFF 3 Monday Heating Hot Water Tuesday Heating Hot Water Wednesday Heating Hot Water Thursday Heating Hot Water Friday Heating Hot Water Saturday Heating Hot Water Sunday Heating Hot Water Reviewing the Programme Times To review your hot water programme move the slider to the HOT WATER position To review your heating programme move the slider to the HEATING position To review the programme times press the OK button repeatedly The appropriate ON and OFF markers will be displayed to show you which time is being reviewed Any of these times can be adjusted by using the or buttons and then confirmed using the OK button Remember to return the slider to the RUN position after reviewing is complete Modifying the Hot Water Programme The hot water programme has three pairs of ON OFF switching times per day Ea
14. 1 to OFF 1 ON 2 to OFF 2 or ON 3 to OFF 3 simply set the ON time and its paired OFF time to the same time and the programme will just ignore them To re enable the time period simply set the two ON and OFF times to be different 11 Choosing the Operating Mode for Heating and or Hot Water The operating mode may only be changed when the slider is set to the RUN position The HM symbol is displayed during a programmed heating on period and a a symbol is displayed during a programmed hot water on period A green INDICATOR LAMP shows when the heating or hot water is switched ON Two MODE buttons are provided to select the Operating Mode and therefore how the heating and hot water are controlled Heating has four possible Operating Modes these are OFF AUTO ONCE CONT Pressing the heating MODE button scrolls round these modes in sequence and the display indicates which mode is currently active HOT WATER HEATING 1 SAT HOT WATER HEATING SAT 19 06 2010 19 06 2010 WUU a FUL a conn Lf lf con lf lf q aw o Honeywell Honeywell e OFF mode The heating will remain OFF e AUTO Automatic mode The heating will be switched ON and OFF according to the heating programme e ONCE mode The heating will come ON at the first programmed ON time and go OFF at the last programmed OFF time e CONT Continuous mode The heating will remain ON continuously
15. 20C and the DT92E display being updated If you press a button on DT92E it may take a few seconds for ST9420C to respond DT92E will indicate it is waiting for information by displaying the hourglass symbol and dashes as shown Heating Indicator The flame symbol indicates that the boiler is on for heating The flame will disappear when there is no heating demand Frost Protection The frost symbol will be displayed if the room temperature goes below the frost setting The flame will also be displayed to indicate when the boiler has been switched on 20 Low Baitery Indicator Battery Replacement The battery symbol will start to flash if the battery power is running low From this point there will be a minimum of 4 weeks before the product will cease to function Batteries are accessed by unclipping the front cover at the bottom Note battery polarity Reverse process to refit front cover Use 2xLR6 AA alkaline batteries only Immediately on power up DT92E will try to communicate and synchronise with ST9420C This process may take up to 4 minutes and will be indicated by the word Sync on the DT92E display RF Communications Indicator A brief flash of the RF symbol indicates the DT92E has been communicating with the other system controls Lockout Your DT92E works in conjunction with the ST9420C time control If the timer is set to OFF or CONT it may not be possible to
16. Programme to Another Day example Monday to Tuesday f Whilst the day is showing Monday Press the COPY DAY button The message COPY MON TO TUESDAY OK will be displayed and the letters TUE will flash to indicate the programme for Monday can be copied to Tuesday g Toselect a different day to copy to press the NEXT DAY button to cycle through the days With each press of the NEXT DAY button the message will change to indicate the new day you are copying to h When the required day is indicated press the green button to confirm and the message MON COPIED will be displayed for a moment The day into which Mondays programme has been copied is now available to have its programme edited Note Once a day s programme has been confirmed in this way it now becomes the day whose programme is copied if the COPY DAY button is pressed again OR Programming a Different Day i Press the NEXT DAY button to select the next day which is displayed along the top of the screen The programme for that day can then be adjusted by following steps b e above Programmes for the remaining days can be set in the same way using the NEXT DAY button to move to the next day 10 Exiting HOT WATER Programming Mode To exit HOT WATER programming mode move the slider to the RUN position This can be done at any time during the programming process and any changes made and confirmed with the button will have been saved Note If the unit is
17. Room Thermostat Control of Your GETTING STARTED WITH YOUR ST9420C Step 1 Setting the Date amp Time eeeecsssseecssessescecceesseeeesenseseceeesatacessanetees Step 2 Running a Built in Programme PROGRAMMING YOUR ST9420C The Built in Programmes Your Personal ProgramMmMe ccccceeceeeesseeeeeeeenees Reviewing the Programme Times Modifying the Hot Water Programme Modifying the Heating Programme Disabling or Enabling Time Periods OPERATING YOUR ST9420C Choosing the Operating MOG sirsenis 12 Overriding the Operation Without Changing the Programmes wa lee The Extra Hour Function The Holiday Function als Enguiy MOOG esasan aretoen n aeee Asa ANEETA aR AEE ESETI RAN ETONE Naaa 14 FINE TUNING YOUR ST9420C Changing from AM PM Time Display to the 24 Hour COCK 15 Changing the Installer Parameters eeeeeeee i Optimi SAO esr iersinii How to set your Hot Water Set Temperatu BOILER SERVICE REMINDER Countdown to Service When Service is Due eeeeeseirrrserrrsssreeeses 18 SMUT OW ihe oar a EER A REEI EN OTO 19 OPERATING YOUR DT92E Inquiring about the Set Temperature Adjusting the Set Temperature 19 Switching Off Display Updates Heating Indicator Frost Protection 20 DT92E OPERATING INDICATORS Low Battery Indicator Battery Replacement RF Communications Indicator Lockout 21 DT92E ENERGY SAVING ECO FEATURE FINE TUNING YO
18. T Display will continue to provide information on the extra hour status To cancel the extra hours just keep pressing the EXTRA HOUR button until the CANCELLED message appears on the LoT Display The Holiday Function The Holiday function allows you to switch off your heating and hot water for a specified number of days from 1 99 days This lets you save energy and related costs when you are away from home but resumes normal operation on the day of your return During this period heating will operate at the OFF frost protection set temperature and the hot water will remain off To set the Holiday function a Ensure the slider is in the RUN position then press the HOLIDAY button once The message SET HOLIDAY will appear briefly followed by SET DAYS AWAY b Use the or buttons to set the number of days you will be away The display will show the number of days and this number will be flashing to indicate it can be changed The day of the week will also keep changing to show the day you return c If you have made a change to the number of days the message DAYS AWAY OK will appear Press the green button to confirm your selection d The message SAVED will be displayed for a few seconds followed by the date you return to enable you to check you have programmed the holiday function correctly e During the holiday period the LoT Display will show the message ON HOLIDAY
19. UR DT92E Changing the DT92E Installer Parameters ce sceeeseseeseeeteeseteeeesseeeeeeneees 23 OPERATING YOUR CS92A HOT WATER THERMOSTAT Basic Operation Battery Replacement Error Indications 25 OPERATING YOUR BDR91T RELAY BOX IF INSTALLED BDR91T Controls Layout Automatic Operation 0 cee ceceeeeereeeeeeeeneneeees 26 Temporary Manual Override Loss of Wireless Communications 0005 26 FAQ AND TROUBLESHOOTING Frequently Asked Questions eiiie aiei 27 Troubleshooting Guide CONFIGURATION amp SERVICE DATA Configuration Data to be completed by Installer cece eeeeeceeeereeeneees 34 Boiler amp System Service Logi sazii a eA anne ce veaenceces 35 General Description of Controls in Your System Your Honeywell ST9420C provides timing control for both your central heating and hot water systems letting you set ON and OFF periods to suit your own lifestyle The ST9420C does not directly control the temperature but works together with other temperature controls such as room thermostats and cylinder thermostats or sensors to control your heating and hot water system in your home With 7 day programming and up to 3 on off periods per day every day can be set differently and heating and hot water can be set at different times from each other ST9420C also has a Boiler Service reminder Shut down feature which helps ensure your gas boiler is regularly serviced in compliance with UK Gas Sa
20. and the display will count down the number of days till you return To cancel the Holiday function f To cancel the Holiday function just press the HOLIDAY button again The LoT Display will show CANCELLED and the unit will return to normal operation Note while setting the Holiday function if there is a gap of more than 1 minute between button presses the function will cancel itself automatically and return to normal operation 13 OPERATING YOUR ST9420C Enquiry Mode As the heart of your system the ST9420C has access to temperature information from the other system components and allows you to enquire about this information To enter Enquiry Mode ensure the slider is in the RUN position then press and hold the button for 4 seconds The LoT Display will show the message INFO MENU to confirm that you have entered Enquiry Mode Pressing the or buttons then allows you to step around and view the available information The LoT Display will continue to update to tell you what information is being viewed and the main display will show the value If the information is not available the display will show dashes instead of a temperature value The table below shows the type and sequence of information available in Enquiry Mode To exit Enquiry Mode If the button is not pressed for 30 seconds your ST9420C will return to RUN mode Information LoT Message Other display symbols R
21. ange the clock automatically at the correct dates so you should never need to adjust the clock forward or backwards yourself It is possible to disable this particular feature as described in the section Changing the Installer Parameters page 15 You may also check the section Configuration amp Service Data page 34 to see how your Installer has configured your product What should do if get lost while programming the ST9420C The LoT Display on ST9420C will provide you with help and tips to work through the programming Should you ever get lost the simplest thing to do is to move the slider to the RUN position and then move it back to the appropriate programming position where you got lost At this point just follow the instructions again What happens if there is a power failure In the event of a mains power failure the ST9420C display will go blank the indicator lamps will go out and the control outputs will switch off The real time will be constantly maintained by means of the built in battery backup ready to power back up as if nothing had happened when the mains power is restored In addition all programmes and settings are stored in a special memory called Non Volatile memory which requires no power to maintain information so will be retained indefinitely Should the correct time and date ever be lost for whatever reason the message SET DATE TIME will be displayed whilst the s
22. atures will be programmed by your Installer Maintenance Engineer or Landlord e If it has been set to do so ST9420C will display a message on the screen to remind you that a boiler service is due e Ifthe service is overdue the Programmer may switch off the heating system to ensure your safety If this happens you must arrange an immediate service visit Contact details should be listed on page 35 of this guide in the section Boiler amp System Service Log e A contact telephone number may also have been programmed into the ST9420C If so a message will appear on the LoT Display indicating the number you should call Countdown to Service Your ST9420C can indicate a countdown for the number of days until your service is due This SERVICE DUES message will appear on the screen every few 1 seconds to give you an opportunity to schedule Jaf ovs a service visit When Service is Due When your boiler service is OVERDUE the words SERVICE DUE will continue to flash on your screen and you should arrange an immediate service visit 18 BOILER SERVICE REMINDER Shut down If your ST9420C shows the words SERVICE DUE and OFF then your boiler service is overdue and the boiler has been automatically switched off to ensure your safety you should arrange an immediate service visit If set to do so it may be possible to obtain limited use of the boiler by pressing any EXTRA HOUR
23. button Each button press will allow operation of the boiler for 1 hour at a time and the screen will 1 display the message On 1h as shown However Lat i you should still arrange an immediate service visit as this will allow you to comply with the law and ensure your gas boiler is operating safely kT Z ia A SERVICE DUE OPERATING YOUR DT92E Inquiring about the Set Temperature DT92E normally displays the measured room temperature To inquire about the set temperature simply press one of the a or buttons The set temperature will be fonaywxel shown on the display along with the arrow symbols and the temperature will be flashing Adjusting the Set Temperature The set temperature is adjusted by pressing the or buttons Each time one of the buttons is pressed the set temperature will change by 0 5 C iT ll 3 eo em _ gt 19 Switching Off Pressing the off standby button ers will switch the DT92E into off G standby mode The symbol will show in the display and the unit will control at the frost protect setpoint as set at the ST9420C To switch back on simply press gg 9 the button again se Display Updates To conserve battery power DT92E only communi cates with ST9420C at regular intervals or when you press a button This means there can be up to a few minutes delay between an action initiated on ST94
24. ch time can be set between 3 00 am and 2 50 am on the next day to allow you to programme the hot water to stay on past midnight if required a Move the slider to the HOT WATER position SET HOT WATER will show briefly to verify this action HOT WATER HEATING DAY TIME SET HOT WATER O HOT WATER O HEATING RUN ES Honeywell b SET ON TIME 1 will then be displayed and the time setting for the first ON 1 time for MONDAY will now be flashing to indicate it can be changed If you do not wish to change the time press the green Ok button and move to the next step If you do wish to make a change use the or buttons to change the first ON 1 time Each press of the button will change the time by 10 minutes As soon as the time has been changed the message ON TIME 1 OK will be displayed Press the green button to confirm the time is correct and move to the next step SAVED will be displayed for a moment to confirm that any change has been saved to memory C HOTWATER HEATING MON ONS TIME 1 K ri O B40 ONI ON2 ON3 OFF1 OFF2 OFF HOT WATER HEATING MON SET ON TIME ie I OND on2 ons OFFI OFF2 OFFS 1O za Honeywell Honeywell MODE Note When pressing the button the next ON or OFF marker may start to flash This indicates you have tried to set a time equal to
25. cylinder sensor If the CS92A batteries need changing the ST9420C will show the message SENSOR LOW BATT and the tap symbol will flash You can confirm this by pressing the CS92A button whereupon the red light will give a brief flash every second to indicate a low battery state It is important to change the CS92A batteries as soon as the low battery condition is indicated as reduced battery power may affect the RF signal strength and impair RF communications How do know when to change the batteries in the DT92E room thermostat If the DT92E batteries need changing the battery symbol will flash on the DT92E display DT92E will continue to operate for at least 4 weeks after the indicator begins to flash The ST9420C will also show the message SENSOR LOW BATT and the radiator symbol um will flash It is important to change the DT92E batteries as soon as the low battery condition is indicated as reduced battery power may affect the RF signal strength and impair RF communications 28 Can I override the Programmer from the DT92E thermostat As well as changing the set temperature from the DT92E it is also possible to override the heating system on or off from the DT92E This is only possible if the ST9420C is in AUTO or ONCE Modes If ST9420C is in CONT mode it will not be possible to switch the heating off from the DT92E Similarly if ST9420C is in OFF mode it will not be possible to switch the heating on from the DT92E
26. der of the ECO time period 22 DT92E ENERGY SAVING ECO FEATURE How to Exit ECO Mode To exit ECO mode simply press the green ECO button again ECO will disappear from the display and the thermostat will control to its previous set temperature FINE TUNING YOUR DT92E Changing the DT92E Installer Parameters The DT92E has a special Installer Mode where some features can be adjusted to suit your lifestyle or preferences these are called Installer Parameters and are listed in the table below along with a description of the options that are possible Your installer should set this up for you to suit your application see CONFIGURATION amp SERVICE DATA section However you may wish to alter some of the settings yourself and this section shows you how to do this INSTALLER Parameter Default Options Description PARAMETER Value Temperature tO 3 to 3 K Offset to measured measurement offset temperature Upper setpoint limit uL 35 21to Upper set temperature 35 C limit in C Lower setpoint limit LL 5 5 to 21 C Lower set temperature limit in C Energy saving ECO ES 18 5 to 35 C Energy saving ECO set setpoint temperature in C Reset parameters Parameter will be set to O to factory settings if any of the other param eter values have been changed Set to 1 to get back to factory settings 23 To Enter Installer Mode a Hold the button for 2 seconds until DT92E is in s
27. ewed if the previous parameter is set to a particular value 24hr or am pm 1 12 12 24 12 am pm display clock display 24 24hr display Configure backlight 2 2 012 0 off operation 1 onif button pressed 2 on continuously Enable disable auto 3 1 0 4 0 disabled time change 1 enabled 1 day or 5 2 day or 4 T 1 5 7 1 1 day operation 7 day operation 5 5 2 day operation 7 7 day operation Number of ON OFFs 5 3 2 3 2 2 on offs per day per day 3 3 on offs per day Select default time A A b C A standard programme b at home C economy Set hot water 60 C 40to Stored hot water set temperature 85 C temperature 15 FINE TUNING YOUR ST9420C INSTALLER Parameter Default Options Description PARAMETER Number Value Optimum start Ea Optimum start limit Optimum stop Frost protection 1 5 temperature 1 5 0 1 2 0 no optimum start 1 delayed start 2 optimum start on 1 2 0 1 0 disabled 1 enabled 5to Frost protection 16 C temperature k 2 Minimum ON OFF time in minutes Minimum ON OFF ime Proportional band 1 width Failsafe mode loss of 1 RF communications Reset all parameters 2 To Enter Installer Mode 1 1 14 Width of control proportional band in C 0 off 0 1 2 3 4 6 1 heating on 20 0 1 0 1 0 do not reset 1 default parameters a Ensure the slider is in the RUN position then press and hold and buttons togethe
28. fety Regulations For more details see pages 18 amp 19 Your system includes a DT92E wireless room thermostat and may include a BDR91T Relay Box to switch your boiler remotely These products use state of the art 2 way RF communications to share information and give you robust and flexible control of your indoor environment The following instructions explain how to programme and use the ST9420C and associated controls to provide the most home comfort at the least cost The way to use a Programmer Think about the time periods when you are typically in the house and when you are not and also the times when you use a lot of hot water These are the times you should use as the basis for the programmes It will be necessary to allow some heat up time for the heating system after periods when it has been off this would typically be 1 1 hours depending on your house and your preferences If Optimum Start has been selected see page 17 you do not have to allow for this heat up time as the Programmer is intelligent and will calculate the correct starting time for your house This is based on measurements it makes about your system characteristics and on the current and target room temperatures All you have to do is programme the time periods when you want to be comfortable Other features are commonly available on the Programmer to enhance comfort and convenience for example OVERRIDE EXTRA HOUR and MODE buttons A typical use
29. ired Step 1 Setting the Date amp Time Your ST9420C had the date and time set at the factory and these are normally maintained by a backup battery in the event of power failures If you wish to change the date or time or if the LoT Display shows the message SET DATE TIME just follow the instructions below Otherwise go to Step 2 a Move the slider to the DAY TIME position The message SET DATE TIME will show briefly on the screen followed by SET THE DAY and the day of the month will now be flashing to indicate it can be changed por WATER HEATING DAY TIME SET THE BAY HOT WATER p oy HEATING le al RUN ma a Honeywell HODE f To change the day of the month press the or buttons until the correct day is shown Each press of the button will change the date by one day As soon as a change has been made the message IS DAY OK will be displayed Once the correct day is reached press the green button to confirm and move to the next step If you do not need to make a change just press the button immediately and this will move you to the next step The month digits will now be flashing and SET THE MONTH will be displayed To change the month press the or buttons until the correct month is shown The message IS MONTH OK will be displayed Press the green button to confirm the month is correct and move to the ne
30. lider is in the RUN position In this case simply follow the procedure described under Step 1 Setting the Date amp Time page 6 It should not be necessary to make any changes to your programmes 27 How reliable is 2 way RF communication The 2 way RF communication also known as wireless communication used by Honeywell is extremely robust and reliable When installed correctly the Signal Strength test feature allows the Installer to locate the system components where mutual signal reception is strong During communication signals are sent several times to ensure receipt and if any message is garbled the error detection software recognises this and ensures the message is repeated again What do do if RF communication is lost Follow the steps in the Troubleshooting Guide on the next page The most likely cause for loss of communications is the DT92E batteries running low on power This will be indicated on the DT92E display by a flashing battery symbol or the display may even be blank Simply replace the batteries as shown on page 21 and wait a few minutes for communications to become re established If this does not resolve the problem it may be that the RF signal path between the ST9420C and the DT92E is blocked by a metal object Check the direct path between the two devices and reposition any object that may be blocking the signal or move the thermostat How do I know when to change the batteries in the CS92A
31. nergy Savings Trust A room thermostat simply switches the heating system on and off as necessary It works by sensing he air temperature switching on the heating when the air temperature falls below the thermostat setting and switching it off once this set temperature has been reached Turning a room thermostat to a higher setting will not make the room heat up any faster How quickly the room heats up depends on he design of the heating system for example the size of boiler and radiators Neither does the setting e i affect how quickly the room cools down Turning a room thermostat to a lower setting will result in th room being controlled at a lower temperature and saves energy The heating system will not work a time switch or programmer has switched it off The way to set and use your room thermostat is to ind the lowest temperature setting that you are comfortable with and then leave it alone to do its job The best way to do this is to set the room thermostat to a low temperature say 18 C and then turn it up by one degree each day until you are comfortable with the temperature You won t have to adjust he thermostat further Any adjustment above this setting will waste energy and cost you more money your heating system is a boiler with radiators there will usually be only one room thermostat to control the whole house But you can have different temperatures in individual rooms by installing hermostatic radiator
32. on O Clock and Buttons Hot Water Operating Mode Button Programme Time Markers Day of Week Indicator RF Symbol Hot Water Operating Mode Indicator Heating ON period indicator Holiday Button Heating Extra Hour Button Copy Day Button Heating Indicator Lamp Next Day Button 6OO00000 Heating Override Button Hot Water Override Button Boiler Status Indicator 12 Slider Keep this document in a Home Information Pack Hot Water Indicator Lamp 88 8G8E6O Hot Water Extra Hour Button DT92E CONTROLS LAYOUT ECO Mode Active Frost Protect Indicator ECO Countdown Indicator O Heating Demand Indicator O Setpoint Change Buttons O ECO Button Q OFF Standby Button O OFF Standby Indicator O RF Communications Indicator 10 Battery Low Indicator 11 Fault Indicator 12 Setpoint Indicator Temperature Display Honeywell CS92A CONTROLS LAYOUT Sensor element Transceiver Green light under button Button Red light under button CONFIGURATION amp SERVICE DATA Configurable Features Options Factory Installer configured setting note value DT92E Configuration 30 C to0t03 0 C o Upper setpointlimit 21to35 c0 Tre Lower setpoint limit 5to210 TC Energy saving ECO setpoint 5to35 C_ dT 180 Boiler amp System Service Log The space below can be used to provide a record of boiler amp system services and the name
33. oom temperature setting ROOM SET F Hot water temperature WATER TEMP fej F Hot water temperature setting WATER SET if This information will be available if you have a room temperature control system with a DT92E room thermostat This information will be available if you have a hot water control system with a CS92A hot water thermostat pe pi 2 ee 4 0 WATER SET eri Bu E 14 Changing from AM PM Time Display to the 24 Hour Clock Your ST9420C can operate on the 12 hour AM PM or 24 hour clock formats To change the format ensure the slider is in the RUN position then press and hold the and buttons together for about 2 seconds Ignore the NOT VALID message that will appear briefly Then the displayed times will be changed automatically to the new format Repeating this procedure will change the clock display back to the original format Changing the Installer Parameters The ST9420C has a special Installer Mode where some features can be adjusted to suit your lifestyle or preferences these are called Installer Parameters and are listed in the table below along with a description of the options that are possible Your installer should set this up for you to suit your application see CONFIGURATION amp SERVICE DATA section However you may wish to alter some of the settings yourself and this section shows you how to do this Note some parameters indicated by may only be vi
34. ostat to a low temperature say 18 C and then turn it up by one degree each day until you are comfortable with the temperature You won t have to adjust the thermostat further Any adjustment above this setting will waste energy and cost you more money DT92E has a green ECO button which enables you to set a period of time at a lower emperature This energy saving feature is most useful if you are out of the house for a few hours or if you want a reduced temperature for a while and don t want to have to remember to turn the temperature back up see pages 22 amp 23 for details Control of Your Boiler There are two ways your boiler may be controlled It may be switched directly using he ST9420C timer or if installed in a remote location it may be switched using a BDR9Q1T relay box n each situation the operation of the boiler is determined automatically by the combination of inputs from the room thermostat and the timer and in such a way as o maintain your comfort with minimal energy use The timer will indicate the on off status of the boiler by showing the flame symbol Optimisation see page 17 for explanatory diagrams Your control system has some features called Optimisation which aim to save energy while making you as comfortable as possible These may or may not be enabled check page 34 where your Installer should have indicated how these were set Optimisation does not apply to your Hot Water only to y
35. ottom Note battery polarity Reverse process to refit front cover Use 2xLR6 AA alkaline lt I JES batteries only Error Indications To save battery power CS92A will indicate error conditions on the LoT Display of ST9420C It is possible to view the CS92A sta tus by pressing the button on the transceiver Zz box The lights underneath this button will ee provide feedback as shown in the table Go to the FAQ AND TROUBLSHOOTING section for more information Flashes up to 5 times in Everything is OK red light shows signal succession then repeats strength press button again to exit Flashes 0 1 s on 0 9 s off Battery low condition replace batteries i Flashes 0 5 s on 0 5 s off Sensor error check sensor connection On continuously Loss of communications BDR91T Controls Layout SN Se Push button Green light relay status indicator Red light indicator for special modes or loss of communications Automatic Operation The BDR91T relay box simply switches the boiler on and off according to a wireless signal it receives from the ST9420C It is mainly used when the boiler is installed in a remote location where it may be difficult to run wires direct from the timer The green light indicates the status of the relay output Green light on relay on Green light off relay off Green LED cal Red LED Temporary Manual Override In normal operation it should not be
36. our Heating Optimum Start works by measuring how quickly your system normally heats up and 5 using this to calculate the correct time to switch on to reach your comfort temperature when you want it So the times you set are when you want the heating to be at the correct temperature and the system adjusts the starting time to meet this Delayed Start is an alternative to Optimum Start It works by using your normal programmed start times compares the actual temperature with the set temperature and delays the start a little depending on how close these temperatures are to each other Optimum Stop saves energy and money by switching off a little earlier than the normal programme time If the house is up to temperature you will not notice the effect on the temperature but you will see a difference in your fuel bill The radiator symbol on ST9420C will flash to let you know whenever Optimisation is operating The other controls in your system should not require adjustment Your ST9420C should have been set up to work correctly when it was installed However the following will show you how you can modify your settings to meet your particular lifestyle To assist you with programming and everyday use your ST9420C will display text messages at every stage to help you get the most out of your central heating and hot water system The ST9420C uses LoT Technology to constantly update the display to give you feedback about what is requ
37. override it from the thermostat and this is indicated by the lockout symbol q To switch the heating on you must go to the timer and set the Mode to AUTO ONCE or CONT 21 The ECO button allows you to change to a lower energy saving set temperature for a period of your choice from 1 to 24 hours This temperature is pre set in the DT92E Installer Mode but you can adjust this to any temperature you want when ECO mode has been activated The default ECO temperature is 18 C At the end of the time period the thermostat will return to its original set temperature Entering ECO Mode and Setting the Energy Saving Time Period Press the green ECO button to enter ECO mode The word ECO will appear on the display and the thermostat will allow you to set the number of hours you want to be at the new set temperature Use the and fy buttons to set the hours up to a maximum of 24 hours Please note ECO mode is not accessible in Holiday mode or if Service shutdown has occurred a o A a gt i C ihr 1 2 3 4 24hr 7 hr a oye 5s ECO X A nn Y JUU What Happens in ECO Mode In ECO mode the display will show a countdown of the remaining time hours and minutes in ECO mode identified by the hourglass symbol The display will alternate every 5 seconds to show the current room temperature When in ECO mode pressing the a or buttons will adjust the set temperature for the remain
38. r ST9420C Programmer will now be operating to the built in programmes These have been designed to provide heating and hot water at typical times throughout the day but if you want to customise the settings please see the next section PROGRAMMING YOUR ST9420C page 8 The Built in Programmes The built in programmes give you a starting point that you can personalise to your own requirements Your Installer should have selected one and is no tick the product normally leaves the factory with Pr matter to select one of the other profi Built in Programme Profile A icked the box alongside it If there ofile A installed but it is a simple es see Changing the Installer Parameters page 15 ON 1 OFF 1 ON 2 OFF 2 ON3 OFF 3 Monday to Heating 6 30am _ 8 30am 12 00pm 1 00pm 4 30pm 10 30pm Friday Hot Water 6 30am 8 30am 12 00pm 1 00pm 4 30pm_ _ 10 30pm Saturday amp Heating 6 30am _ 9 30am 12 00pm 1 00pm 4 30pm_ _ 11 00pm Sunday Hot Water 6 30am 9 30am 12 00pm 1 00pm 4 30pm 11 00pm Built in Programme Profile b ON 1 OFF 1 ON 2 OFF 2 ON3 OFF 3 Monday to Heating 6 30am _ 9 30am 2 00pm 1 00pm 4 30pm 11 00pm Friday Hot Water 6 30am 9 30am 12 00pm 1 00pm 4 30pm _ 11 00pm Saturday amp Heating 6 30am _ 9 30am 2 00pm 1 00pm 4 30pm_ _ 11 00pm Sunday Hot Water 6 30am 9 30am 12
39. r for 8 seconds Ignore the NOT VALID message that is displayed for a few seconds The message SET UP MENU will show briefly followed by SET INSTALLER OK b Press the button to take you into the Installer Mode Parameter Menu c Parameter 1 is now available to change This is to allow you to change the clock format from 12 hour AM PM to 24 hour At every step the LoT Display will inform you what the parameter means and what option you have selected The parameter number is shown on the display separated by a colon from the parameter value d You can change the parameter value by pressing the or buttons At this point the description in the LoT Display will change and the parameter value will flash If you press the value will stop flashing and be saved for use 16 e Press Qk to move to the next parameter available for editing f Keep pressing to step around the list of parameters and use or buttons to change the parameter value g Any parameter changes that have been confirmed with the button will be saved and used To Exit Installer Mode h You can exit Installer Mode at any time by moving the slider to the next position and then back again to RUN Note Installer Mode will exit automatically after 10 minutes if the slider is not moved Optimisation The Optimisation features are explained on page 5 Parameters 9 10 and 11 are used to enable or disable and set these
40. re controls In order to save energy the following general points should be observed 1 Ensure your system contains a room thermostat and a hot water thermostat and that both are set to appropriate temperature levels typically 20 C for the room temperature and between 50 60 C for the hot water temperature 2 Programme your heating and hot water to be off when you are not in the house If you are concerned about possible frost damage to any exposed pipe work it is advisable to fit a frost protection system your installer can advise you about this 3 Think about how you use your domestic hot water if you have a storage system it is not necessary to have this switched on all the time even when you are in the house 4 Consider the heat up times required for your central heating Every home responds differently when the heating is switched on Adjust the start time so that you are not cold when you get up in the morning A shorter heat up time is required for other heating periods 5 In the evening when the house is up to temperature it is often possible to switch off the heating up to an hour before you go to bed without any noticeable reduction in comfort ST9420C CONTROLS LAYOUT OVERRIDE ON1 ONZ gt ONS OFF1 OFF2 OFF3 Hot Water ON period indicator Time Display LoT Technology Display 13 Heating Operating Mode Indicator 14 Heating Operating Mode Button OK Next Butt
41. s and contact numbers of the Installer and Service Personnel This information is important for a Home Information Pack Service Installation Installation Service Date Engineer Telephone Number Contact Details This product and its associated documentation and packaging are protected by various intellectual property rights belonging to Honeywell Inc and its subsidiaries and existing under the laws of the UK and other countries These intellectual and property rights may include patent applications registered designs unregistered designs registered trade marks unregistered trade marks and copyrights Honeywell reserves the right to modify this document product and functionality without notice This document replaces any previously issued instructions and is only applicable to the product s described This product has been designed for applications as described within this document For use outside of the scope as described herein refer to Honeywell for guidance Honeywell cannot be held responsible for misapplication of the product s described within this document Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sarl ACS ECC EMEA Z A La Pi ce 16 1180 Rolle Switzerland by its Authorised Representative Honeywell Inc 35 Contents CONTROL OF YOUR SYSTEM General Description of Controls in Your System The way to use a Programmer The way to use a
42. tandby mode b Hold a and buttons for 3 seconds until the word Inst appears on the display c Press the a button The first parameter is now ready to be changed To Select a Parameter Use the a and p buttons to move from one parameter to the next Stop at the Parameter you wish to change To Change a Parameter Use the standby button to select the parameter value then the a and y buttons to change the value Confirm the change by pressing the button again to take you back to the parameter To Exit Installer Mode Hold the button for 3 seconds to exit Installer Mode Note The Installer Mode will exit automatically after 10 minutes if no adjustments have been made in this time 24 Basic Operation Your CS92A consists of a sensor element that is strapped to the metal surface of the hot water cylinder and a wireless transceiver box that is normally mounted on a wall surface apart from the cylinder The transceiver communicates with the ST9420C programmer and regularly sends the hot water temperature measurement to it Sensor element Transceiver Battery Replacement The CS92A batteries should last for a minimum of 2 years Well before they run out CS92A will communicate with ST9420C and it will show the message SENSOR LOW BATT whilst also flashing the tap symbol Batteries are accessed by unclipping the front cover at the b
43. valves TRVs on individual radiators If you don t have TRVs you should choose a temperature that is reasonable for the whole house If you do have TRVs you can choose a slightly igher setting to make sure that even the coldest room is comfortable then prevent any overheating in other rooms by adjusting the TRVs Room thermostats need a free flow of air to sense the temperature so they must not be covered by curtains or blocked by furniture Nearby electric fires televisions wall or table lamps may prevent the hermostat from working properly Honeywell Control Systems Ltd Arlington Business Park Bracknell Berkshire RG12 1EB Technical Help Desk 08457 678999 50047645 008 A www honeywelluk com 2011 Honeywell International Inc System Components This section is to be completed by the Installer Location ST9420C typically in living room or hallway typically next to hot water tank in bedroom BDR91T If installed typically next to boiler Energy Efficiency and the Environment Home energy use is responsible for more than 1 4 of the total UK carbon emissions which contribute to climate change Heating and hot water systems based on boilers account for of this figure so it is important to understand how your controls can help to maximize energy efficiency while maintaining your comfort Your Programmer should be used in conjunction with appropriate temperatu
44. xt step The year digits will now be flashing and SET THE YEAR will be displayed To change the year press the or amp buttons until the correct year is shown The message IS YEAR OK will be displayed Press the green button to confirm the year is correct If you have made a change and the date is a valid date the message DATE SAVED will show and you can move to the next step If the date you set was not valid for example 31 September the message INVALID will show and you will be returned to the start of the date setting operation The time will now be flashing and the message SET THE TIME will be displayed To change the time press the or buttons until the correct time is shown Each press of the button will change the time by one minute Holding the button down for more than a few seconds will change the time slowly at first then quickly The message IS TIME OK will be displayed Press the green button to confirm the time is correct If you have made a change the message TIME SAVED will show followed quickly by DATE TIME COMPLETE Move the slider to the RUN position to complete setting the date and time Note if the slider is moved at any time before the date and time have been set correctly the message DATE UNCHANGED will be displayed briefly and your changes will not be saved Step 2 Running a Built in Programme With the date and time correct you
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